#188 Antenna Tutorial incl. cheap DIY Antenna Tester (LoRa, ESP32)

Everything goes wireless these days. This is why we have a close look at the “black magic” of antennas, how they work, what is essential, and how to test them.
Based on this knowledge we will build a cheap antenna tester for LoRa antennas. A similar device can be built to test Wi-Fi antennas.
It uses an ESP32 TTGO board on one side and a Wemos D1 mini with a Hope RFM95 module on the other side.

Links:
Sketches: https://github.com/SensorsIot/Antenna-Tester
Stuart's Page: http://www.loratracker.uk/
and his results: https://github.com/LoRaTracker/Test-Reports
Watts to dBm converter: https://www.rapidtables.com/convert/power/Watt_to_dBm.html / http://www.g4urh.co.uk/amateur_radio/watt_converter.php
Radio link budget calculator: http://en.jirous.com/calculation-wifi
Coax cable loss calculator: http://www.qsl.net/co8tw/Coax_Calculator.htm
Ground plane Calculator: http://www.csgnetwork.com/antennagpcalc.html
LoRaWAN Balloon experiment: http://bit.ly/2DgSBUB
Moxon Antenna: http://www.moxonantennaproject.com/
Moxon antenna 3D: https://www.thingiverse.com/thing:2124434
VSWR to dB table: http://bit.ly/2IgrWuI
50$ satelite: http://www.50dollarsat.info/page1.html


Supporting Material and Blog Page: http://www.sensorsiot.org
Github: https://www.github.com/sensorsiot

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